Improved marble-sawing machine



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DUNCAN MCDoUGALD CAM PBELL' AND JoHNsTEvENs', oF osWEGo,

NEW YORK.

ALetters Patent No. 85,280, dated December 29. 1868.

IMPROVED MARBLE-SAW'ING- MACHINE.

The Schedule referred to in these Letters Patent and makingA part of the sama To all lwhomct may concern:

Be it known that we, DUNCAN MCDOUGALD CAMP- BELL and J ORN STEVENS, of Oswego, in the county of Oswego, and State of New York, have invented a new and useful Improvement in Marble-Sawingli'achines; and we do hereby declare that the following is a full, clear, and exact description thereof, which will enable those skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part of this speoication, in which- Figure 1 is aside view of our invention;

Figure" 2 is a sectional yend view, taken in the line Figure 3 is a horizontal section, taken in the line y y in iig. l; and

Figure 4is a horizontal section, ltaken in the line z z in iig. 1. Y

Similar letters of reference indicate like parts in all the iigures.

This invention relates to certain improvements in marble or stone-sawing machines, whereby the saws are adj usted to operate at various angles, and at different distances from each other, with`the greatest fa, eility, as hereinafter more fully explained.

In the accompanying diawings- A A is a frame-work, in which 1s suspended a sawholding frame, B B, by means of cords c c.

The saw-holding frame B is suspended in such manner as to slide vertically in the main frame A, for the lpurpose of feeding the saws down to their work, and is p rovided with adjustable guides e e and driving-bands -Each saw, Gr, figs. 1 and 2,' is held in a sash, h h, g g, tig. 1, the two horizontal bars, g g, of which run 'in grooves in the guides e e, as shown in fig. 2.

These guides or guide-blocks e are adjustable laterally in slots b b iu the frame B, fig. 3, and are secured by means of screw-bolts passing through said slots b.

Each pair of guide-blocks e carries one or more vertical rollers k, igs. 2 and 4, vwhich act-as guides for the driving-straps or belts f.

For sawing .blocks in a tapering 'or monumental form, the saws are set as shown by g g, fig. 4.

The saws may be of any desired number, a gang of four saws being shown in the drawings.

F is a' slidingr bar, to which the driving-power is ap`` plied. This bar slides through uprights m m in the frame B, tig. 4; the belts j' `being fastened to this sliding bar, and arrangedaround the rollers It, as showin by red lines in fig. 4f, and secured to the heads of the saw-sashes. The saws are moved longitudinally in their various positions by a like` movement ofthe driving-bar F.

The belts j' are secured to the heads h iu an ad- 'jnstable manner by means of loop's n' n, iig. 1, which jam the belts against said heads h by means of nuts 'r on the back sides oi' the heads; and when the saws are to be arranged at a new angle, or the distance between them is to be changed, then the loops n are slackened, and when the belts j' are thus set free from the heads h, the guide-blocks e are adjusted in the slots b, fig. 3, so as to bring the saws'into the required position, and the belts f then being drawn tight again,

are secured by the clamping-loops n., and the machine is ready for working.

The main part ofthe weight of the frame B is sustained by a'oolinterbalance-Weight placed on the rope v fi l. i), Bf these means the saws are brought to actin any desired position-with great readiness, and avery snug, efficient, and inexpensive apparatus is obtain'ed.

Having thus described our invention,

What we claim as new, and desire to secure by Letters Patent, is? v The laterallyfadjustable guides@ e, rollers k k, belts f f, and clamping-loops n 11'in connection with the saws G y lt and feeding-trame B,l all constructed and operating as herein shown and described, and for the purpose set forth.l

The above specification of our invention signed by ns, this 24th day of September, 1868.

D. MGD. CAMPBELL. JOHN STEVENS.

Witnesses:

.JOHN H. MOORE, Y

HERBERT C. WHITNEY. 

